body{
    background: url("../img/2.jpg");
    animation-name: bg;
    animation-duration: 20s;
    animation-delay: 2s;
    animation-iteration-count: 2;
    animation-play-state: running;

}
@keyframes bg {
    0%{background:url("../img/2.jpg");}
    /*50%{background:url("../img/2.jpg");}*/
    100%{background:url("../img/2.jpg");}
}
.form{background: rgba(255,255,255,0.6);width: 400px;margin: 120px auto;}

.fa{
    display: inline-block;
    top: 27px;
    left: 6px;
    position: relative;
    color: #ccc;
}
input[type="text"],input[type="password"]{padding-left: 26px;}
.checkbox{padding-left: 21px;}